woocommerce_product_is_in_stock │ filter-hook │ WC 1.0

Returns whether or not the product can be purchased. This returns true for 'instock' and 'onbackorder' stock statuses.

Usage

add_filter( 'woocommerce_product_is_in_stock', 'wp_kama_woocommerce_product_is_in_stock_filter', 10, 2 );

/**
 * Function for `woocommerce_product_is_in_stock` filter-hook.
 * 
 * @param  $string 
 * @param  $that   
 *
 * @return 
 */
function wp_kama_woocommerce_product_is_in_stock_filter( $string, $that ){

	// filter...
	return $string;
}

$string

-

$that

-

Where the hook is called

return apply_filters( 'woocommerce_product_is_in_stock', 'outofstock' !== $this->get_stock_status(), $this );

Where the hook is used in WooCommerce